A female whose father was colourblind marries a normai male whose father was also colourblind. What is the probability that their son will be colour blind?

Q. A female whose father was colourblind marries a normai male whose father was also colourblind. What is the probability that their son will be colour blind?

A. 0%

B. 25%

C. 50%

D. 75%

Answer: 50%